JPS60198281A - Typewriter - Google Patents

Abstract

PURPOSE:To uniformly correct a character, by setting the correcting pressures in ovelap correcting actions to be different from each other, in accordance with the details of a bold face character to be corrected. CONSTITUTION:When correcting a bold face character printed by two-time printing actions consisting of printing an image (L-L') and printing an image (R-R'), a one-time correcting action for an image (LL-LL') staggered from the image (L-L') by a displacement of alpha is conducted with a correcting pressure of TB, and a one-time correcting action for an image (RR-RR') staggered rightward from the image (R-R') by a displacement of alpha is conducted with a correcting pressure of TC. Then, a one-time correcting action for an image (C-C') at the center of the bold face character (L-R') is conducted with a correcting pressure of TA. The correcting pressures are set in a relationship of TA>TB>=TC, whereby the bold face character is uniformly corrected in accordance with the details of the character, such as the number of strokes in the character.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a typewriter capable of printing bold characters (hold printing) using typeface, and erasing capital letters when correcting the bold characters, and in particular, relates to a typewriter that can print bold characters (hold printing) and erase capital characters when correcting the bold characters. 3
This invention relates to a typewriter in which bold print can be erased without any trouble by erasing twice, and the quality of erasing is improved by varying the erasing pressure each time.

[Prior art] In recent years, the performance of typewriters used in electronic type-likes and word processors has improved, and large-character printing, in which bold characters are formed by sending small amounts of the same character and overprinting them, has come to be used. Along with this, there is a need for erasing such bold characters to be corrected or otherwise printed.

However, in erasing not only uppercase characters but also normal printing, erasing only once at the same position as the printed character is not enough for the motor that rotates the type wheel to select the type, the carriage drive device, and the platen drive device. The printed position and the erased position often deviate from each other due to errors in the stop position or play in the mechanical parts, or the performance of the printing ribbon, resulting in some amount of unerased data.

Therefore, in order to eliminate such unerased portions, an erasing method is often used in which the erasing operation is performed two or more times by shifting the position of each character by a small amount to the left and right. Conventionally, when erasing uppercase letters, the erase operation is repeated two or more times for each print that makes up the bold letters, shifting the position by a small amount to the left and right as described above. I was going.

However, since there is an error of 172 to 2 times between the minute feed amount to shift the print position to print uppercase characters and the minute feed amount to shift the erase position to erase bold characters, Similarly, if you erase uppercase characters by repeating the erasing operation 4 times, 2 times for each print,
There were disadvantages in that the erased parts overlapped, resulting in deterioration of the printing paper, layering of the printed surface, and the amount of collection ribbon used was more than twice the amount used in normal character erasing.

[Objective] The object of the present invention is to eliminate the above-mentioned conventional drawbacks, to minimize the number of overlapping erases when erasing bold printed capital letters, and to reduce the amount of minute feed during overlapping erasing to a relatively large amount. To provide a typewriter that can erase data reliably and uniformly even when the data is erased.

Another object of the present invention is to perform two overlap erasures using a minute feed amount that surely exceeds the minute feed amount in double overlap printing of bold printing, and further erase one time in the center of uppercase letters. In addition to ensuring that bold characters can be erased, uniform erasing can be achieved by varying the pressure of the type wheel that presses the collection ribbon each time depending on the content of the print to be erased, such as the strokes of uppercase letters. Our goal is to provide a typewriter that can perform the following tasks.

[Example] The present invention will be described in detail below by way of example with reference to the drawings.

Here, the present invention will be explained in detail by taking as an example the case where the present invention is applied to an electronic typewriter whose carriage is driven by a linear pulse motor. In explaining this, first, the configuration of an electronic typewriter to which the present invention is applied will be explained in detail.

FIG. 1 shows the appearance of this type of electronic typewriter. In the electronic type-like with the configuration shown in the figure, the keyboard 1
By operating the keys arranged in , the type 5a provided on the type wheel 5 mounted on the carriage 2 is struck from the back side by the hammer 6a in the printing hammer unit 6 toward the platen 3 via the printing ribbon. As a result, printing is performed on the printing paper 4 on the platen 3.

FIG. 2 shows an enlarged view of the appearance of the carriage portion of an electronic typewriter having such a structure. In the figure, the carriage 2 has a scale rail 8 arranged parallel to the platen 3.
The upper part of the carriage 2 is moved left and right by a guide roller 9 and a linear pulse slider 10 provided at the bottom of the carriage 2.

A type embossing mechanism consisting of a type wheel 5 and a printing hammer unit 6 is provided in the portion of the carriage 2 facing the platen 3, and behind the type embossing mechanism,
A printing ribbon cassette 7, which stores a printing ribbon 7a and is spread out in front of the type wheel 5, is mounted.

The detailed internal structure of the carriage 2 is shown in FIG. 3 with respect to the portion on the lower stand 11 exposed by removing the print ribbon cassette 7. In the illustrated configuration, the print ribbon 7a stored in the print ribbon cassette 7 is pulled out by a shift arm 14 projecting forward and stretched over the front surface of the type wheel 5. The exposed portion of the printing ribbon 7a is connected to a rotating shaft provided on both sides of the rear side of the printing ribbon cassette 7 in the configuration shown in the second figure during printing operation. arrow A shown in FIG. 2 by a plunger (not shown) with b as the center.
A feed reel is rotated in the direction of , and is interposed between the type 5a on the type wheel 5 and the printing paper 4 on the platen 3, and is rotatably supported on the right and left outer sides of the front of the lower stand 11 for feeding the erasing ribbon 13. Of the +2a and the take-up reel 12b, the rotation shaft of the take-up reel 12b passes through a through hole provided in the lower stand 11, and a sawtooth gear 18 is attached to the tip thereof. This gear 16 is connected by a plunger 15 via an arm 18 rotatably mounted on the upper part of the lower stand 11. Each time iJ moves up and down, it advances by one tooth, rotates the take-up reel 12b, winds up the erasing ribbon 13, and moves it by one character. The presser foot screw 17 engaged with the sawtooth gear 18 serves to prevent the gear 1B from reversing and to stop the teeth on its periphery each time it rotates by one tooth.

Furthermore, for the supply reel 12a of the erasing ribbon 13,
The ribbon presser 19 is biased by a coil spring 21 additionally installed on the lower stand 11 on the shaft 2o, and the third
It is constantly pressed in the direction of arrow E shown in the figure, and the pressing force of this ribbon presser foot 18 prevents the erasing ribbon 13 from being wound irregularly or sagging when being fed one character at a time.

The erasing ribbon 13 pulled out from the reels 12a and 12b is stretched between a key-shaped shift arm 14 supported on both left and right sides of the lower stand 11 and its guide rollers 14a and 14b.

Regarding the movement of the carriage 2, a slider section 1o for a linear pulse motor is provided at the bottom of the lower stand 11, which is comprised of a U-shaped yoke (not shown) and a coil (not shown) wound around the yoke. A linear pulse motor is configured such that it can be moved by a guide roller 8 at a constant distance from a scale part 8 made of a magnetic material having grooves arranged at equal intervals.

Note that the hammer unit 6 is configured to be driven by a solenoid, and the printing pressure can be controlled by the energization time to the solenoid.

Next, an example of the configuration of a circuit device for erasing bold characters by applying the present invention to an electronic typewriter configured as described above is shown in FIG. An example of a detailed configuration is shown in FIG.

In the circuit device shown in FIG. 4, a control logic circuit 24 is controlled and driven by input from a keyboard logic circuit 23.
The various control signals 36 to 42 from the drive circuit 35 are amplified to appropriate levels by the drive circuits 25 to 31 of the drive circuit 35, and then the various control signals 36 to 42 are amplified to appropriate levels by the drive circuits 25 to 31 of the drive circuit 35, and then the control signals 36 to 42 are amplified to appropriate levels by the drive circuits 25 to 31 of the drive circuit 35, and then the control signals 36 to 42 are amplified to appropriate levels by the drive circuits 25 to 31 of the drive circuit 35.
15, 22, 10, 33, and 34, respectively, and the driving devices of these parts are respectively actuated in response to key operations on the keyboard 23.

In the control logic circuit 24 shown in FIG. 5, which forms the control center of such a circuit device, a multiplex unit (MP
U) 43 is read only memory (ROM) 44,
A random access memory (RAM) 45, an address path 47 and a read/write path (R/W) are connected between the interface/control logic circuit 46 and the keyboard 23 via a common data/hash 48.
It is configured so that microinstructions and data coded with reference to 48 can be exchanged. With this circuit configuration, read-only memory (ROM) 4
4 or random access memory (RAM) 45 according to preprogrammed microinstruction instructions.
U) 43 executes calculation control sequentially. The keyboard logic circuit 23 operates by key operations on the keyboard 1.
The multiplex unit (MPU) 42 is requested to perform interrupt processing by the above program via an interrupt signal 11150, and at the same time, microcoded key information necessary for the interrupt processing is input onto the data bus 48.

On the other hand, interface control logic circuit 4
Reference numeral 6 latches the microcoded drive tk information for each unit, converts it into each control signal 36 to 42 for each unit drive, and delivers it to each unit drive circuit 25 to 31. In the drive circuit 35, each part control signal 36-42 is amplified by the part drive circuits 25-31, respectively, and the drive device 5
Each device 8, 32, 15, 22, 10.33 and h3 of 1
Adjust the level to a level suitable for driving 4.

Next, let δ be the minimum resolution of the linear pulse motor used as the carriage drive motor, and let the carriage movement amount when printing bold characters be β (='nδ: n = integer), calculate the positional relationship for uppercase character printing and erasing. This will be explained by taking as an example the upper case printing of the character 11'HI+ shown in FIG.

Here, the shaded area indicates bold printing, and the area inside the frame indicated by a chain line outside of the bold printing indicates the erased area.

As shown in the figure, the first printing in overlapping printing results in (
After the character tlHn (LL') is printed and the carriage is moved by β, the character (R-R') is printed a second time.
) is printed, and the overlapping printing results in the capital letters %1.) (LR'). H11 is formed. When erasing this capital letter II H11, at the left edge of the capital letter 15H'' shown in the figure, please check the margin for stop position errors and looseness of each drive mechanism part such as the print wheel and carriage, or the slack and wear of the collect ribbon and print ribbon. The minute movement amount to the left required for the carriage when erasing the print including do.

With regard to the above-mentioned positional relationships necessary for printing and erasing bold characters, the erasing positional relationships for uppercase characters according to the conventional method and the present invention are shown in comparison in FIG. 7 and FIG. Flowcharts representing the process are shown in FIG. 9 and FIG. 1θ, respectively.

In the conventional capital letter erasing method, as shown in FIG. , the position was shifted to the left by the amount of movement α (LL
-LL') twice and two times when the position was shifted to the right by the movement amount α (LR-LR?), a total of 4
The erase operation was performed twice. Therefore, the hammer was used to erase each capital letter four times, slightly shifting its position, to erase the same typeface.

In the flowchart shown in FIG. 9 showing the process of erasing capital letters by the conventional method as described above, in step S1, the collection ribbon is moved by one character, and then in step S2, the carriage is moved to the right from the printing position by the amount of movement α. In step S3, the type wheel is rotated to the position of the same type as the printed character. After preparing such a state IL, in step S4, a hammer is struck for the same energizing time as during printing to perform an erasing operation. Next, in step S5, the carriage is shifted leftward by a moving amount 2α from the current stop position, and in step S6, it is determined whether or not this is the second erasure of the same printed character. If it is the second erasing, in step S7 the carriage is moved to the left by the moving part -β-α and returned to the printed character position, and in step S8 it is correct shifted, and it is determined in step S6 that the second erasing If it is not erased, the collect ribbon shift is canceled, the carriage is shifted to the right by the amount of movement α+β from the current stop position in step S10, the collect ribbon is moved by one character in step Sll, and then the shift is performed. Sa;, =- guA t-=
In contrast, in the present invention, as shown in FIG.
For the two printings (LL') and (R-R/) that make up a bold character, first, the printing of (LL') was shifted by the amount of movement α to the left (LL - LL / ) becomes 1
The times are erased by pressing the collection ribbon in accordance with the energization time Ta of the hammer drive solenoid, and the ribbon is shifted by the amount of movement α to the right from the printing of (RR') (RR - RR /). One erasure is performed by pressing the collection ribbon corresponding to the energization time Ta of the hammer drive solenoid. Next, if α>β between the minute feed amount α during erasing described above and the minute feed amount β during printing described above, that is, there is a gap between the erased portions due to the two times of erasure, and the erasure is not completed. Considering the case where a remainder occurs, at the midpoint of the printing (LR'), (c-
One erasure shown by c') is performed by pressing the collector ribbon corresponding to the energization time T8 of the hammer drive solenoid.

That is, when comparing the erasing operation according to the conventional method shown in FIG. 7 and the erasing operation according to the present invention shown in FIG. 8 for the printing shown in FIG. Despite this, the number of times the type wheel is struck and the number of times the collection ribbon is suppressed are both significantly reduced compared to the prior art.

In addition, during each erasing operation, the energization time T^ of the type wheel solenoid, 're + TC, TA > T.
By creating a relationship of B≧Tc, the erasing pressure in each erasing operation is changed, so that uniform erasing is performed according to the content of the strokes of bold characters, and the portion of the printing paper is An appropriate energization time shall be selected in advance and stored in a read-only memory or the like to prevent damage. For example, it is stored in the memory such that the erasing pressure for the center of the printed portion is set high and the erasing pressure for both left and right sides is set low.

In the flow chart shown in FIG. 10 representing the process of erasing capital letters according to the present invention as described above, step S2
In Step 1, the collection ribbon is shifted by one character, in Step S22, the type wheel is rotated to the position of the same type as the printed character, and further, in Step S23, the carriage stop position is brought to the center of the bold character printing. to move the carriage. After preparing for such a situation,
In step S24, the hammer Φ solenoid is energized for a time T^ to erase (c-cr). Next, in step S25, the carriage is moved to the right from the current stop position by a minute feed amount α+β/2, and in step 52f3, the hammer solenoid is energized for a time 're, and (RR-RR '), and after that, step S2? At step 828, the carriage is moved to the left by a minute feed amount β from its current stop position, and the hammer solenoid is energized for a time TB to erase (Ll, -LL'). , cancel the collection ribbon shift.

[Effects] As is clear from the above description, according to the present invention, when erasing large characters resulting from two overlapping printings by overlapping erasing, the minute carriage feed amount required for overlapping erasing is smaller than when printing bold characters. Considering the case where the feed amount is larger than the minute amount and there is a gap in the erased area, a total of three erasing operations are performed to completely cover the uppercase characters, reducing the damage to type and printing paper during erasing as in conventional methods. A special effect can be obtained in that it is possible to eliminate waste and to appropriately vary the erasing pressure each time to perform uniform, high-quality bold character erasing.

In addition, in the following explanation, the minute feed amount in both the left and right directions during overlap erasing is made equal to make it symmetrical, but
Of course, almost the same effect can be obtained even if the feed is slightly asymmetrically left and right. Further, the present invention can be applied not only to erasing capital letters printed by slightly feeding the carriage, but also to erasing capital letters printed by slightly rotating the type wheel, and substantially the same effect can be achieved.

[Brief Description of the Drawings] Fig. 1 is a perspective view showing the external appearance of the electronic type-like according to the present invention, a perspective view showing an enlarged ridge portion, and Fig. 3 a perspective view showing the detailed internal structure of the carriage. , FIG. 4 is a block diagram showing an example of the configuration of a circuit device for erasing uppercase letters of the electronic typewriter, FIG. 5 is a block diagram showing an example of the configuration of the control circuit portion of the circuit device, and FIG. 7 is a diagram showing an example of the positional relationship between uppercase letter printing and erasing, FIG. 7 is a diagram showing an example of the erasing positional relationship in the conventional capital letter erasing method, and FIG. 8 is a diagram showing an example of the erasing positional relationship in the present invention. FIG. 8 is a flowchart showing the process of erasing bold characters according to the conventional method, and VJIOLia is a flowchart showing an example of the process of erasing bold characters according to the present invention. 2... Carriage, 3... Platen, 4... Print paper 5... Type wheel, 5a... Type, 60... Hammer unit, 6a... Hammer, ? ... Printing ribbon cassette, 7a... Printing ribbon, 7b... Rotating axis, 8... Scale rail, 13... Correction ribbon, 23... Keyboard logic circuit, 24... Control logic Circuit, 25...Hammer drive circuit, 26...Print ribbon shift solenoid drive circuit, 27...Collect ribbon shift solenoid drive circuit, 28...Type wheel motor drive circuit, 28...Carry engine drive Circuit, 30... Ribbon feed pulse motor drive circuit, 31... Platen feed pulse motor drive circuit, 32... Ribbon shift drive device, 33... Ribbon feed drive device, 34... Platen feed drive device , 35... Drive circuit, 36... Hammer control signal, 37... Print ribbon shift control signal, 38... Collection ribbon shift control signal, 38... Type wheel motor control signal, 40... carriage motor control signal,
41... Motor control signal for sending the ribbon, 42... Motor control signal for sending the platen, 43... Multiplex unit (MPU), 44... Read only memory (ROM), 45...
Random access memory (RAM), 46...Interface control circuit, 47...a) Refhas. 48...1 浣Jlysu/lI: including ii, i i; (
R/piece, 48...dekuhuff, 50...:'+'lli)d buoy++', star on +. 51-! J1. Motion: 21'Ivi. 'JIl++1%1 person'-A'-4'4r,,":i
;1';Rino・f'l'l'i'l・9 Figure 1

Claims (1)

[Scope of Claims] 1) In a typewriter that prints capital letters by shifting the type by a minute amount to the left and right and is capable of erasing the printed capital letters, a minute amount of printing is performed to the left and right of the bold printed portion. A typewriter characterized in that the erasing is performed in a shifted manner, the erasing is performed on the center of the uppercase character printed part, and the erasing pressure in each erasure is made to be different depending on the content of the uppercase characters. 2. The typewriter according to claim 1, wherein the erasing pressure for erasing the center of the bold character printed portion is different from the erasing pressure for erasing both left and right ends of the large character printed portion. .